Feeling ambitious? You can walk from Greenwich town center along the Thames Path. It’s about a 30-minute scenic stroll past the Cutty Sark and the eco-domes. Major bonus points for fresh air and zero traffic.
Cycling? There are Santander Cycles (aka “Boris Bikes”) dotted around. Dock your bike at the O2’s own cycle hub. You’ll feel like a local, and you’ll save the entrance fee. Just lock it up tight—no one wants a missing wheel after the show.